﻿using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Text.RegularExpressions;
using System.Threading.Tasks;

namespace Daemon.Common.Helpers
{
	public static class CommonHelper
	{
		public static string GenerateSurname()
		{
			string name = string.Empty;
			string[] currentConsonant;
			string[] vowels = "a,a,a,a,a,e,e,e,e,e,e,e,e,e,e,e,i,i,i,o,o,o,u,y,ee,ee,ea,ea,ey,eau,eigh,oa,oo,ou,ough,ay".Split(',');
			string[] commonConsonants = "s,s,s,s,t,t,t,t,t,n,n,r,l,d,sm,sl,sh,sh,th,th,th".Split(',');
			string[] averageConsonants = "sh,sh,st,st,b,c,f,g,h,k,l,m,p,p,ph,wh".Split(',');
			string[] middleConsonants = "x,ss,ss,ch,ch,ck,ck,dd,kn,rt,gh,mm,nd,nd,nn,pp,ps,tt,ff,rr,rk,mp,ll".Split(','); //Can't start
			string[] rareConsonants = "j,j,j,v,v,w,w,w,z,qu,qu".Split(',');
			Random rng = new Random(Guid.NewGuid().GetHashCode()); //http://codebetter.com/blogs/59496.aspx
			int[] lengthArray = new int[] { 10, 10, 10, 10, 10, 10, 11, 11, 11, 12 }; //Favor shorter names but allow longer ones
			int length = lengthArray[rng.Next(lengthArray.Length)];
			for (int i = 0; i < length; i++)
			{
				int letterType = rng.Next(1000);
				if (letterType < 775) currentConsonant = commonConsonants;
				else if (letterType < 875 && i > 0) currentConsonant = middleConsonants;
				else if (letterType < 985) currentConsonant = averageConsonants;
				else currentConsonant = rareConsonants;
				name += currentConsonant[rng.Next(currentConsonant.Length)];
				name += vowels[rng.Next(vowels.Length)];
				if (name.Length > 4 && rng.Next(1000) < 800) break; //Getting long, must roll to save
				if (name.Length > 6 && rng.Next(1000) < 950) break; //Really long, roll again to save
				if (name.Length > 7) break; //Probably ridiculous, stop building and add ending
			}
			int endingType = rng.Next(1000);
			if (name.Length > 6)
				endingType -= (name.Length * 25); //Don't add long endings if already long
			else
				endingType += (name.Length * 10); //Favor long endings if short
			if (endingType < 400) { } // Ends with vowel
			else if (endingType < 775) name += commonConsonants[rng.Next(commonConsonants.Length)];
			else if (endingType < 825) name += averageConsonants[rng.Next(averageConsonants.Length)];
			else if (endingType < 840) name += "ski";
			else if (endingType < 860) name += "son";
			else if (Regex.IsMatch(name, "(.+)(ay|e|ee|ea|oo)$") || name.Length < 5)
			{
				name = "Mc" + name.Substring(0, 1).ToUpper() + name.Substring(1);
				return name;
			}
			else name += "ez";
			name = name.Substring(0, 1).ToUpper() + name.Substring(1); //Capitalize first letter
			return name.ToUpper();
		}
	}
}
